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Finding the Fourth Proportional to 112.77, 168.81 and 74.18

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Solution

The fourth proportional to 112.77, 168.81 and 74.18 is: 111.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.77 : 168.81 = 74.18 : x
  2. Step 2: Convert to fraction form
    112.77/168.81 = 74.18/x
  3. Step 3: Cross multiply
    112.77x = 168.81 × 74.18
  4. Step 4: Simplify right side
    112.77x = 12,521.48
  5. Step 5: Solve for x
    x = 12,521.48/112.77
  6. Step 6: Final answer
    x = 111.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.